By Ute Christina Herzfeld
Although it truly is ordinarily understood that the Antarctic Ice Sheet performs a severe function within the altering worldwide process, so far there's a normal loss of on hand info at the topic. The Atlas of Antarctica is the 1st atlas at the 7th continent to be released in twenty years. It comprises a hundred forty five actual topographic and elevation maps derived from satellite tv for pc information (GEOSAT and ERS-1 radar altimeter data), that are the simplest in their style to be had this present day. every one map is observed by way of an outline of geographic and glaciological features.
The introductory chapters familiarise the reader with the area of the Antarctic Ice Sheet and its position within the worldwide approach, in addition to discussing satellite tv for pc distant sensing and geo-statistical tools at textbook point. purposes contain special local reports of 15 outlet glaciers of the inland ice, a few of that are at the moment altering speedily. mixtures with SAR facts facilitate the examine of floor constructions and circulate features.
Despite its state of the art medical accuracy, the Atlas of Antarctica isn't just meant to be used through researchers and scholars in glaciology, geophysics, distant sensing, cartography and Antarctic study, but in addition informative and stress-free for any reader drawn to the 7th continent. The Atlas is followed via a CD-ROM containing all of the atlas maps and elevation versions – permitting the reader to find a wealth of interesting information in Antarctica!
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Additional resources for Atlas of Antarctica: Topographic Maps from Geostatistical Analysis of Satellite Radar Altimeter Data
21 The latter include corrections for tracker bias, waveform sampler gain, calibration biases, antenna gain patterns, Doppler shift, range acceleration, oscillator drift, and pointing angle. Because the ﬁrst satellite carrying an altimeter, SEASAT, was designed for oceanographic and ocean-geodetic observations, data processing followed the principles of processing over the oceans. SEASAT data are also valuable for ice research. Data processing over ﬂat ice areas works similarly to that over the ocean surface (Brown 1977; Partington et al.
Brenner, and coworkers), using the following correction methods: (a) transformation of “waveform data records” (WDR) into “ice data records” (IDR), (b) “retracking”, correction for position (Martin et al. 1983); see also Partington et al. (1987), Thomas et al. (1983) on ice-edge detection, (c) correction for atmospheric eﬀects (Zwally et al. 1983), (d) correction for solid earth tides (Zwally et al. 1983), (e) slope correction of the ice surface (Brenner et al. 1983), (f) correction for water vapor (wet atmospheric correction), (g) referencing to Goddard Earth Model (GEM T2) satellite orbits (Marsh et al.
0 GHz. Above 18 GHz, atmospheric attenuation increases rapidly; thus the signal would loose power on its way through the atmosphere. At frequencies below 2 GHz, Faraday rotations and refraction of electromagnetic radiation by the ionosphere increase, and interference from ground-based sources increases (navigation, communication, radar; civilian and military sources). Also the antennas would have to be too big. The size of the antenna footprint on the Earth’s surface is proportional to the wavelength of the electromagnetic signal and inversely proportional to antenna size.